Apex domains cannot have CNAME records.
Question and response
Question
dig omf.com. NS
Answer
omf.com. 5 NS ns-1057.awsdns-04.org.
omf.com. 5 NS ns-262.awsdns-32.com.
omf.com. 5 NS ns-740.awsdns-28.net.
omf.com. 5 NS ns-1982.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0